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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment in receivable portfolios, net $ 2,890,613 $ 2,382,809 $ 2,440,669 $ 2,143,560
Fluctuation in discount rate 1.00%      
Convertible senior notes, carrying value $ 483,500 448,500    
Senior secured notes, carrying value 326,029 11,320    
United States        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Increase or decrease of the fair value 44,900      
Europe        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Increase or decrease of the fair value 64,500      
Other geographies        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Increase or decrease of the fair value 6,600      
Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Convertible senior notes, carrying value 450,800 416,500    
Level 2 | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value estimate of convertible senior notes incorporates quoted market prices 520,900 431,700    
Cabot Senior Secured Notes | Secured Debt        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Senior secured notes, carrying value 1,214,600 1,295,700    
Cabot Senior Secured Notes | Level 2 | Secured Debt        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of senior notes 1,258,900 1,312,700    
Fair Value | Certain Loans Acquired in Transfer Not Accounted for as Debt Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Receivables fair value disclosure 3,415,300 2,446,600    
Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration 10,612 2,531    
Recurring | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration 10,612 2,531    
Recurring | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration 0 0    
Contingent Consideration        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Increase (decrease) contingent consideration liability 10,808      
General and Administrative Expense | Contingent Consideration        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Increase (decrease) contingent consideration liability $ (2,800) $ (8,100)